Mac shows my external hard drives as internal hard disks

In disk utility it says they are internal hard disks. I have to check the box "Hard disks" in the finder preferences in order for them to show up on the desktop. When on the desktop they have the same icon as the "Macintosh HD" Hard disk instead of the orange external hard drive icon. How can I change them back to normal external hard drives?

Yes I am using a USB3 hub. When I connect the drives directly to the mac they appear normally as external hard drives. Thanks for suggesting this, I never thought about the hub. Do you know why the hub causes this?

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